21020012212200 has 192 divisors, whose sum is σ = 69408248837760. Its totient is φ = 5244019998720.

The previous prime is 21020012212079. The next prime is 21020012212223. The reversal of 21020012212200 is 221221002012.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 21020012212200.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4466617 + ... + 7873416.

It is an arithmetic number, because the mean of its divisors is an integer number (361501296030).

Almost surely, 2^{21020012212200} is an apocalyptic number.

21020012212200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21020012212200 is an abundant number, since it is smaller than the sum of its proper divisors (48388236625560).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21020012212200 is a wasteful number, since it uses less digits than its factorization.

21020012212200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12340236 (or 12340227 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 21020012212200 its reverse (221221002012), we get a palindrome (21241233214212).

The spelling of 21020012212200 in words is "twenty-one trillion, twenty billion, twelve million, two hundred twelve thousand, two hundred".